<VV> Drag race

[Craig Nicol]

Jim Said:
  A 164 cuin Corvair puts out 35 hp @1,600 rpm, the approximate stall 
rpm of the torque convertor.  One hp is 9.3 btu per second.  So, 325 
btu per second.  Transmission fluid has a coefficient of heat of 
0.5.  Figuring six quarts of fluid at 1.7 lbs per quart gives about 
65 degrees F per second for the Corvair.   In other words the 
transmission gets really hot really quick when the brakes are locked 
and the gas pedal floored.
Jim Davis 

Craig adds:
Drag racers have to move up to the start line, set for a moment, then creep
about 8 " to trip the staging light. Once there, you set the line lock or
trans-brake (locks in two gears). When both lanes' staging lights are lit,
there will be a drag race in a maximum of two seconds; after both staging
lights are lit, that's when you hit the gas. Most of the time, there is only
1-second of locked run-up. 65-degrees of ATF rise isn't going to hurt a
thing and the idea is to WIN, right :-)

In the case of the poster, I think he was talking about flag-start fun runs
but the same thing is true - 1-2 seconds of stall.  BTW, a stall test is a
normal part of transmission testing - the books recommend 5-seconds max,
which has to be a real scorcher behind a big block or especially a diesel.

Craig Nicol

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